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    <script>
        //ES6允许形参赋初始值
        // 1.形参初始值,具有默认值的参数,一般要靠后
        function add(a, b, c = 10) {
            return a + b + c
        }
        let result = add(1, 2)
        console.log(result);


        // 2.默认值与解构赋值结合
        function connect({ host, username, password }) {
            console.log(host, username, password);

        }
        connect({
            host: 'localhost',
            username: 'root',
            password: 'root',
            port: 3306
        })
    </script>
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